Even though the Persian Civilization has played a great role as the prototype of human civilization, it was destined to be the `Lost Civilization`. What does `Lost Civilization` mean? It means that the history of World including the festivity studies has been distorted. I suggest that we should compare the Persian Learning with India(Pakistan), China, Arab and Greek Learning in the field of History, Religion, Thought, Philosophy and so on. So, we have got to find out distortion of each field. What is the purpose of Learning? Above all, to purse the Learning is to seek the Truth. We has continued to pursue for the Truth. However it has been distorted and concealed. This is the big contradiction and we fall into the tremendous chaos in the field of Humanities and Culture. This article is focusing on Nawruz. It is widely known as the Iranian New Year and held in the Central Asia and Caucasus and Mesopotamia, as well. This article is dealt with the origin and meaning of Nawruz, the Secret of Number `7`, Belief system of the Sacred tree, the entity of `Two Fishes Design` and the festivity of fire. In other words, Nawruz is consisted of the Sofreye-Haft Sin, Chaharshanbe Suri and Sizdah Bedar.